Fastened up, like a public house (6)
I believe the answer is:
barred
'fastened' is the definition.
(barring is a kind of fastening)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for barred that I've seen before include "Excluded, blocked" , "Refused entry to local pub" , "Prohibited" , "Refused access to, say pub" , "Wouldn't allow" .)